Baron Clonbrock, of Clonbrock in the County of Galway, was a title in the Peerage of Ireland

Peerage of Ireland

The Peerage of Ireland is the term used for those titles of nobility created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are Duke, Marquess, Earl,...

. It was created on 3 June 1790 for Robert Dillon, who had earlier represented Lanesborough

Lanesborough (Parliament of Ireland constituency)

Lanesborough was a constituency represented in the Irish House of Commons until 1800.-1692–1801:...

 in the Irish House of Commons

Irish House of Commons

The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

. His grandson, the third Baron, sat in the House of Lords

House of Lords

The House of Lords is the upper house of the Parliament of the United Kingdom. Like the House of Commons, it meets in the Palace of Westminster....

 as an Irish Representative Peer

Representative peer

In the United Kingdom, representative peers were those peers elected by the members of the Peerage of Scotland and the Peerage of Ireland to sit in the British House of Lords...

 and served as Lord-Lieutenant of Galway. He was succeeded by his eldest son, the fourth Baron. He was also an Irish Representative Peer and Lord-Lieutenant of Galway. The title became extinct on the death of his son, the fifth Baron, on 1 November 1926.

This branch of the Dillon family was descended from Gerald Dillon, brother of Sir Richard Dillon, ancestor of the Earls of Roscommon

Earl of Roscommon

Earl of Roscommon was a title in the Peerage of Ireland. It was created on 5 August 1622 for James Dillon, 1st Baron Dillon. He had already been created Baron Dillon on 24 January 1619, also in the Peerage of Ireland. The fourth Earl was a courtier, poet and critic. The titles became dormant on the...

. An earlier ancestor, Sir James Dillon, was the brother of Sir Maurice Dillon, ancestor of the Viscounts Dillon

Viscount Dillon

Viscount Dillon, of Costello-Gallen in the County of Mayo, is a title in the Peerage of Ireland. It was created in 1622 for Theobald Dillon, Lord President of Connaught. The Dillons were an Hiberno-Norman landlord family from the 13th century in a part of County Westmeath was called 'Dillon's...

. Robert Dillon, grandfather of the first Baron, represented Dungarvan

Dungarvan (Parliament of Ireland constituency)

Dungarvan was a constituency represented in the Irish House of Commons until 1800.-History:In the Patriot Parliament of 1689 summoned by King James II, Dungarvan was represented with two members.-1689–1801:...

 in the Irish Parliament.

Barons Clonbrock (1790)

• Robert Dillon, 1st Baron Clonbrock (1754–1795)
• Luke Dillon, 2nd Baron Clonbrock (1780–1826)
• Robert Dillon, 3rd Baron Clonbrock
  Robert Dillon, 3rd Baron Clonbrock
  Robert Dillon, 3rd Baron Clonbrock , was an Irish peer.Dillon was the son of Luke Dillon, 2nd Baron Clonbrock, by the Honourable Anastasia, daughter of Joseph Blake, 1st Baron Wallscourt. He was educated at Eton and Christ Church, Oxford. In December 1826, aged 19, he succeeded his father in the...
  
   (1807–1893)
• Luke Gerald Dillon, 4th Baron Clonbrock
  Luke Dillon, 4th Baron Clonbrock
  Luke Gerald Dillon, 4th Baron Clonbrock KP PC was an Irish peer.In 1865, he was appointed High Sheriff of County Galway. He became Baron Clonbrock in 1893 on the death of Robert Dillon, 3rd Baron Clonbrock and was appointed a Knight of the Order of St Patrick on 29 August 1900....
  
  (1834–1917)
• Robert Edward Dillon, 5th Baron Clonbrock (1869–1926)